page_title: WASP-121b
hierarchical_section_title: WASP-121b
caption_attribution_description: English: The top of the planet's atmosphere is heated to a blazing 2,500 degrees Celsius (4,600 Fahrenheit), hot enough to boil some metals. Image credit: NASA, ESA, and G. Bacon (STSci)
context_page_description: WASP-121b is an extrasolar planet orbiting the star WASP-121. WASP-121b is the first exoplanet found to contain water in an extrasolar planetary stratosphere. WASP-121b is in the constellation Puppis, and is about 850 light-years from Earth.
context_section_description: WASP-121b is an extrasolar planet orbiting the star WASP-121. WASP-121b is the first exoplanet found to contain water in an extrasolar planetary stratosphere (i.e., an atmospheric layer in which temperatures increase as the altitude increases). WASP-121b is in the constellation Puppis, and is about 850 light-years from Earth.
caption: Artist's impression of WASP-121b and its host star
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